Hello, i have some problems with my iphone.I have tethered jailbreak, so i install ulstrasn0w fixer and then ultrasn0w but i still don't have signal, sometimes appear one bar.Wifi works fine. I have no idea what i need to do. The simpliest way is downgrade to older soft becouse on 4.1.3 everythings works fine, but i have no saved SHSH...

Did any one have some idea what it could be??

i would be very glad if some one help me